GPT-6 Sol vs GPT-6 Luna

GPT-6's capability tier against its value tier, twenty times apart on both input and output price with the same context window on each.

What the numbers say

• GPT-6 Luna is about 20x cheaper on output tokens (6.0 vs 120 credits per 1M).
• Both take the same 1.1M-token context window.
• GPT-6 Luna is the newer release (September 2026 vs September 2026).

Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Side by side

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts GPT-6 Sol and GPT-6 Luna in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.

Frequently asked questions

What is the difference between GPT-6 Sol and GPT-6 Luna?

GPT-6 Luna is about 20x cheaper on output tokens (6.0 vs 120 credits per 1M). Both take the same 1.1M-token context window. GPT-6 Luna is the newer release (September 2026 vs September 2026).

Is GPT-6 Sol or GPT-6 Luna cheaper?

GPT-6 Luna is cheaper: 6.0 credits per million output tokens against 120. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Which has the larger context window, GPT-6 Sol or GPT-6 Luna?

Neither: both take 1.1M tokens.

Can I use both GPT-6 Sol and GPT-6 Luna on Zeplik?

Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.

Do GPT-6 Sol and GPT-6 Luna need a paid plan?

Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.

Related comparisons

• Claude Opus 5.5 vs GPT-6 SolBoth shipped on the same day at adjacent tiers: whether Opus 5.5's depth is worth double GPT-6 Sol's price when their context windows are within five percent of each other.
• GPT-6 Luna vs GPT-5.6 LunaThe cheapest upgrade on the board: GPT-6 Luna halves its predecessor's input price and cuts output by well over half, at the same 1,050,000-token window.
• GPT-6 Sol vs GPT-5.6 SolThe generational swap with no price to argue about: GPT-6 Sol replaces GPT-5.6 Sol at an identical $2 in and $10 out, with the same 1,050,000-token window.
• GPT-6 Luna vs Gemini 3.8 FlashThe value tier at its current edge: GPT-6 Luna undercuts the newest Gemini Flash by seven and a half times on both legs, with a marginally larger window.
• GPT-6 Sol vs GPT-6 AstraThe upgrade decision inside the GPT-6 line: Astra costs five times Sol for the same 1,050,000-token window, so the question is which work is hard enough to need it.
• GPT-6 Luna vs DeepSeek V4 Flash 0423The honest throughput comparison: DeepSeek's flash tier is cheaper still per output token, and it cannot read an image, which GPT-6 Luna can.